R OWCDraft Indian Standard - Bureau of Indian Standards
Contents
1. DRAFT IN DOCUMENT DESPATCH ADVICE WIDE CIRCULATION ef ate MHD 22 T 02 13 12 2011 TECHNICAL COMMITTEE MHD 22 ADDRESSED TO 1 All members of Water Purification System Sectional Committee MHD 22 2 All Members of Medical Equipment and Hospital Planning Division Council MHDC 3 All others interested Dear Madam s Sir s Please find enclosed the following documents DOC NO MHD 22 187 TITLE Draft Indian Standard for Reverse Osmosis based POU water purifiers for house hold purpose Specification Kindly examine the draft Indian Standard and forward your views stating any difficulties which you are likely to experience in your business or profession if this is finally adopted as National Standards Last date for comments 13 03 2012 Comments if any may please be made in the format enclosed and mailed to the undersigned at the above address In case no comments are received or comments received are of editorial nature you will kindly permit us to presume your approval for the above document as finalized However in case of comments of technical in nature are received then it may be finalized either in consultation with the Chairman Sectional Committee or referred to the Sectional committee for further necessary action if so desired by the Chairman Sectional Committee The document is also hosted on BIS website www bis org in Thanking you Yours faithfully Rakesh Kumar Encl As Above Scientist F amp2. from where product water falls into the storage tank 6 0 MAINTENANCE OF THE PRODUCT 6 1 This Reverse Osmosis system contains a replaceable treatment component critical for effective reduction of total dissolved solids The product water shall be tested periodically to verify that the system is performing satisfactorily 6 2 For all filtration components like sediment filter activated carbon filter and RO membrane filter manufacturer shall declare the maximum possible life in terms of litres of water which can be processed through each filter Factors affecting the performance of the filters shall be mentioned All these information shall be provided in the user manual 6 1 1 The manufacture shall give explicit instructions in the user manual and also on the product for cleaning and disinfecting of the storage tank by halogenated solutions usually chlorine or any other equivalent disinfectant The recommended frequency shall also be mentioned in the user manual 7 0 MARKING 7 1 A name plate shall be fixed on the body of the purifier at a conspicuous location The nameplate shall be marked with the following details a Brand name b Production serial number c Model name or code d Maximum flow rate in 1 h e Recovery Rating f TDS reduction g Supply voltage whether single or three phase frequency volts and wattage 8 0 INSTRUCTION MANUAL 8 1 An instruction manual for the proper method of operation and use of th
3. 10 1 0 1S 3025 part 60 mg l Max Lead as Pb 0 15 10 0 01 1S 3025 part 47 mg l Max Mercury as Hg 0 006 10 0 002 1S 3025 part 48 mg l Max Nitrate as No3 30 00 10 10 1S 3025 part 34 mg l Max Iron as Fe 0 9 10 0 3 1S 3025 part 53 mg l Max Pesticides total 0 03 of each 0 01 of each Table 5 of IS 10500 ug l Max pesticide pesticide Second revision 0 05 Total pesticides E Coli 107 100 99 9999 Table 6 of IS 10500 ml reduction Second revision MS2 Viruses 107 100 99 99 Clause 4 2 of 10500 ml reduction Second revision Cryptosporidium 5 X10 3 100 99 9 Clause 4 3 of 10500 ml reduction Second revision Giardia lamblia 5 X10 3 100 99 9 Clause 4 3 of 10500 ml reduction Second revision Uranium To be decided To be decided later later 5 8 ELECTRICAL SAFETY 5 8 1 The entire electrical circuit shall be insulated from the water purifier such that leakage current shall not be more than 210 uA when tested in accordance with IS 302 5 8 2 The electrical circuit shall also be capable of withstanding for 1 minute a high voltage test at 1500 V rms between body and live parts when tested in accordance with IS 302 5 8 3 All parts of metallic construction shall be permanently and reliably connected to an earthing termination within the purifier and shall be free of rough or sharp edges or other hazards that may cause injury to persons adjusting servi
4. Head MHD FORMAT FOR SENDING COMMENTS ON BIS DOCUMENTS Please use A4 size sheet of paper only and type within fields indicated Comments on each clauses sub clauses table fig etc be started on a fresh box Information in Column 5 should include reasons for the comments and suggestions for modified wording of the clauses when the existing text is found not acceptable Adherence to this format facilitates Secretariat s work DOC NO MHD 22 187 TITLE Draft Indian Standard for Reverse Osmosis based POU water purifiers for house hold purpose Specification LAST DATE OF COMMENTS 13 03 2012 NAME OF THE COMMENTATOR ORGANIZATION SI Clause Sub lause Commentator para table fig Orgn Abbreviation Comments Justification amp Proposed change Draft for Comments only Doc No MHD 22 187 Draft Indian Standard Reverse Osmosis based POU water purifiers for house hold purpose Specification BUREAU OF INDIAN STANDARDS Not to be reproduced without permission of BIS or used as standard Last date of receipt of comments is 13 March 2012 Water Purification System Sectional Committee MHD 22 NATIONAL FOREWORD Formal clauses will be added later The quality of water available for human consumption is a direct measure of the health of the population community and indirectly to that of the country In populated countries like India the quality of drinking wa
5. 9 Influent challenge level The mixture of water and contaminants entering a system 1 10 Chemical reduction A reduction in the quantity of one or more specified organic or inorganic contaminations in drinking water 1 11Contaminant An undesirable physical chemical or microbiological substance or parameter in water that may have an adverse health effect aesthetic effect or both 1 12 Treatment technique TT A process intended to reduce or remove the level of a contaminant in drinking water 2 REFERENCES The following Indian standards contain provisions which through reference in this text constitute provision of this standard At the time of publication the editions indicated were valid All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below IS 302 Part 1 1979 Safety of household and similar electrical appliances Part 1 General requirement Sth revision IS 3025 Part 10 1984 Method of sampling and test physical and chemical for water and waste water part 10 Turbidity first revision IS 3025 Part 25 1986 Methods of sampling and test physical and chemical for water and wastewater Part 25 Chlorine demand first revision IS 14724 1999 Ultraviolet water disinfection system Specification IS10500 Drinking water specification Second revision IS 9845 1
6. Reverse Osmosis is often used in commercial and residential water purification It is also one of the methods used for desalination of brackish water and seawater In Reverse Osmosis based water purifiers normally a spiral wound membrane element is used along with pretreatment filters consisting of sediment filters activated carbon filters etc 1 2 Membrane A semi permeable barrier that allows preferential passage of water Commonly used reverse osmosis membranes include cellulose triacetate and aromatic polyamide polymers popularly known as TFC membrane 1 3 Drinking water Water that is intended for human consumption for drinking and cooking purpose from any source in compliance with IS 10500 drinking water specification 1 4 Daily production rate The volume of product water produced by a system per day 1 5 Point of use drinking water treatment system A plumbed in or faucet mounted system used to treat the feed water from a single tap for direct consumption or use but not used to treat the water majority of the facility or for distribution 1 6 Recovery rating The percentage of the influent water to the membrane portion of the system that is available to the user as reverse osmosis treated water when the system is operated without a storage tank or when the storage tank is bypassed 1 7 Flow control A device for controlling the flow rate of a specified stream 1 8 Product water Water that has been treated by a system 1
7. 8 12 and 16 hr shut off provisions One at Day 2 to 4 5 of the first days production rate Minimum every 6 hr pressure Day 5 and 6 rest under pressure One at Day 7 144hr and 4 hr Maximum pressure prescribed by Manufacturer Sampling is done after running for 15 min 12 TEST 1 TDS REDUCTION TESTS FOR POU R O WATER PURIFIER Application This method is applicable for the TDS reduction R O drinking water treatment system shall reduce the influent challenge level 1500 100 mg l TDS or the manufacturer s maximum TDS claim by at least 75 or the output TDS shall be less than or equal to 500 mg l as per the maximum desirable TDS concentration specified in IS 10500 Analyses All analyses shall be conducted in accordance methods referenced in IS 3025 Part 16 TDS REDUCTION TEST WATER Chlorine free deionized water shall be used with the following specific characteristic maintains throughout the test reduction claims Turbidity lt INTU pH 7 50 5 Temperature 27 2 C Conductivity 1 microsiemen Sodium chloride shall be added to the test water to achieve a challenge concentration of 1500 100 mg L TDS TDS reduction Daily production rate recovery rating and efficiency rating Two systems shall be conditioned in accordance with the manufacturer s instruction using test waters specified in the above table The system shall be tested using the appropriate influent challenge water at the mi
8. 998 Determination of overall migration of constituents of plastics material and articles intended to come in contact with foodstuffs Method of analysis APHA Standard Methods for the Examination of Water and Wastewater 21st edition EPA Environmental Protection Agency methods for the analysis of water 3 CONSTRUCTION 3 1 Inlet port Their inlet port shall be so designed that it can be connected to the tap 3 2 Method of mounting The units for domestic use shall facilitate wall mounting or counter top under the sink installation etc 3 3 Main components and installation Reverse Osmosis Water purifier shall have the following components a b Sediment filter clarity filter An effective filtration system required to remove the suspended solids like fine particles from water and to remove the turbidity before R O membrane treatment Filter or media for the removal of Chlorine and organic matter from water c Reverse Osmosis membrane cartridge d e f g h i Taste enhancer Media or and carbon to improve the taste of R O treated water Booster pump Reject water control valve or similar mechanism to control the water flow or and pressure Power supply Auto shut off mechanism to avoid over flow and protect the dry running of pump Flushing mechanism 4 MATERIALS 4 1 Materials in contact with drinking water shall not impart levels of extractable contaminants that exceed the permissible
9. CLAIMS 5 7 1 The minimum recovery shall equal to or more than 20 5 7 2 Recovery of purified water shall be tested at both the minimum and maximum points of the operating range as per manufacturer s specification range The production rate shall be assessed after setting the recovery conditions by measuring the product volume in liters for 10 continuous minutes and dividing the volume in litres by 10 The tests shall be conducted when the unit and the input water have been conditioned at 27 2 C 5 7 3 Daily production rate should not be less than 5 litres in an hour 5 7 4 The manufacture shall declare the recovery TDS range of purified water and production rating along with input feed TDS and operating pressure Table No 1 Claims for inorganic organic chemicals and microbiological reduction shall be made for the specific contaminants shown in below table To qualify for a specific contaminant reduction claim the system shall reduce the level of the contaminant from the influent challenge to the specified limits Contaminant Influent Maximum Method of testing challenge allowable level mg l product water level mg l Arsenic as Ag 0 30 10 0 01 IS 3025 part 37 mg l Max Cadmium 0 03 10 0 003 1S 3025 part 41 as Cd mg l Max Chromium 0 30 10 0 05 1S 3025 part 52 as Cr mg l Max Copper as Cu 3 00 10 0 05 1S 3025 part 42 mg l Max Fluoride as F 8 00
10. ation This method is applicable for mechanical filtration claims The system shall reduce the influent challenge level of 15 2 NTU to not more than 5 NTU This level of turbidity shall be maintained to all sampling points during rest Analytic method All analysis shall be in accordance with the applicable methods referred in IS 3025 part 10 Apparatus e Nephlometric turbidity meter Test Procedure Chlorine free deionized water shall be used with the following specific characteristic maintains throughout the test reduction claims Turbidity lt INTU pH 7 50 5 Temperature 21 IEC Conductivity 1 microsiemen Sodium chloride shall be added to the test water to achieve a challenge concentration of 1500 100 mg L TDS Influent Challenge The fine grade standardizes test dust that meet SAE J 726 specifications shall be used The test dust shall have a nominal size classification of 0 5 micrometer and shall have 96 of its particle with in the 0 5 micrometer range and 20 to 40 of its particle greater than 2 5 micrometer 16 TEST 5 MICROBIOLOGICAL TEST FOR POU R O WATER PURIFIER A 1 The water purifier must eliminate all types of water borne disease causing microorganisms from the water The test shall be performance based utilizing realistic worst case challenge organism and test conditions and the effluent water quality shall be equivalent to that of a public water supply meeting the microbiological requir
11. cing or using the system 5 9 POWER SUPPLY 5 9 1 The purifier requiring power up to 1 kW as of those for domestic use shall be capable of working with a single phase 220 10 V 50 Hz a c supply 5 9 2 The purifier requiring power above kW shall be capable of working with a three phase 415 20 V 50 Hz a c supply 5 10 HYDROSTATIC TEST 5 10 1 All the portions of the purifier through which the water passes shall be checked by hydrostatic test at pressure at 294 24 Kpa The membrane cartridge and other accessories connected to the system from the booster pump discharge like pipes fittings instruments etc up to the product discharge valve and reject discharge point to the booster shall be tested at least 1 5 times exerted by the maximum pressure exerted by the booster pump 5 10 2 Leakage of the unit to be tested by closing the outlet of the purifier There shall not be any leakage from any of the joints bowls connectors etc when the pressurized unit is held for 15 minutes Initially hydrostatic pressure to be raised slowly so that the required pressure is reached within 5 minutes 5 10 3 The pressurization to be done only on the filters after the booster pump which is subjected to clogging Pressurization of the unit shall be done in following manner a From the Inlet port till the outlet port of the Filter prior to the pump at 196 16 Kpa pressure b From the inlet port of the Pump till the outlet port of the Product water
12. e purifier shall be supplied along with the purifier It shall also include the life and specification of all the filters consumables 9 0 CERTIFICATION MARKING 9 1 The purifier may also be marked with the Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act 1986 and the Rules and Regulations made there under The details of conditions under which the license for the use of Standard Mark may be granted to manufactures or producers may be obtained from the Bureau of Indian Standards 10 0 PACKING 10 1 The packing of purifiers shall be as agreed to between the purchaser and the manufacturer 10 ANNEX A SAMPLING PLAN FOR POU R O WATER PURIFIER Samples of Product water shall be collected after emptying the storage tank Allow at least 1 lit of Product water to flow and collect sample Challenge While collecting challenge test water care must be taken that the sampling point is just before the entry into the Product Before initiating any tests when the RO membrane is new follow manufacturer s instruction for Flushing Use Challenge water for this purpose Conduct TDS reduction tests Microbiological tests Pesticide reduction tests and all other Chemical tests to be done on 4 different membranes independently Make sure metallic solutions do not precipitate while preparing Challenge water Testing Laboratories shall standardize the sequence of addition of these metals i
13. ed flushed and conditioned as per the instruction e If incase the instructions are not available system can be operated by closing the out let until the storage tank is full e Incase on components it can be flushed with one unit volume using the exposure water at an initial inlet static pressure of 340 Kpa 50 psig or 3 40 kg cm e Sufficient components or systems shall be exposed to provide the required volume for analysis Test water Specification Exposure Water e TDS 50 5 mg l pH 6 75 0 25 e Temperature 27 2 C Exposure Procedure e As per the manufacturers instruction flush and condition system or components inlet pressure as per manufacturer specification e Fill with exposure water and maintain for 24 hrs at 27 2 C and 2Lof sample can be collected for analysis e According to the manufacturer instruction the system or component can be flushed refilled and maintained for another 24hrs at 27 2 C amp 2L sample can be collected again for analysis e The above said process can be repeated to give a total of three 24 h exposure and 2L sample e Combine all the 3 samples and analyze all the contaminants for exposure water amp extractant water as per IS standards Passing Criteria of the Product Membrane Preservatives 21 e After the system installation and flushing process we must carry out the membrane preservative test where the membrane preservative shall not be present in the product water at a lev
14. el of toxicological significance 22
15. ements and the intent of the national primary drinking water regulations A 2 CHALLENGE ORGANISM Selected Standard challenge organism shall be Escherichia Coli whichever strain is available with Premier culture collection centers in India A 2 1 Colony Characteristics on M Endo Agar Typical round dark colonies with green metallic sheen A 2 2 Culture Media Nutrient Broth Peptone 5 0 g NaCI 5 0g Beef extract 1 5g Yeast extracts 1 5g Reagent grade 1000 ml Water Final pH 25 C 74 0 2 A 2 3 Growth Medium M Endo Agar Grams liter Casein enzymatic hydrolysate 3 7 Peptic digest 3 7 Tryptose 7 5 Yeast Extract 1 2 Lactose 9 4 Mono Potassium Phosphate 3 3 Di Potassium Phosphate 1 0 Sodium Chloride 3 7 Sodium Desoxycholate 0 1 Sodium Lauryl Sulpaht 0 05 Sodium Sulphite 1 6 Basic Fuchsin 0 8 Agar 15 pH 71 2 0 2 17 A 2 3 1 Gram s Staining Reagents Grams iodine crystal violet solution saffranin solution ethyl alcohol A 3 PREPARATION A 3 1 Inoculums Preparation Using an inoculating needle transfer the pure culture into a sterile and cooled nutrient broth culture tube 10 ml and incubate at 37 0 5 C for 24 h A 3 2 Dilution Water Dechlorinated sterile tap water shall be used for preparation of dilution water A 3 3 Test Water Spike 5 1 of dilution water with 1 ml of E Coli cell suspension broth culture This test water should produce a count of at least 2 0 x 10 5 CFU ml otherwise count can easi
16. level for various polymeric materials when tested as per IS 9845 1998 4 2 Materials of construction 4 2 1 Those surfaces of the components of the purifier which are expected to get wetted by the flow of water through the purifier shall be made of corrosion resistant materials or shall have corrosion resistant treatment or coating of food grade quality The coatings when applied shall not be soluble in water and shall not peel off at the maximum flow velocity expected at the surface 4 2 2 The materials used for construction of the filter chamber shall be pressure resistant to the extent of maximum pressure exerted by the booster pressure All the material shall be non leaching type up to the time duration which is declared by the manufacturer 4 2 3 All materials which are expected to get wetted by the flow of water through the purifier shall be of food grade material 4 3 Membrane preservatives The manufacturer shall declare the chemical preservative used in the membrane and flushing requirement etc in the user guide for consumer 5 PERFORMANCE REQUIREMENTS 5 1 General A R O based POU water purifier system shall be so designed and constructed that its intended purpose is accomplished when installed and operated in accordance with the manufacturer s instructions 5 2 Flow control 5 2 1 If the performance of a system or component is dependent on a specified flow rate a pre set flow control shall be provided as an integral par
17. ly be standardized by few preliminary tests The test water shall be used as influent water and shall have following characteristics a Turbidity lt 1 NTU b PH value 6 5 to 8 5 c Temperature 27 2 C A 4 TEST PROCEDURE FOR SAMPLING Pass the test water through the RO system while it is ON A 5 MEMBRANE FILTRATION PLATING AND INCUBATION A 5 1 Output Effluent sample Using MF technique filter 100 ml of each sample through 0 45 u membrane filter Keep membrane on to an M Endo agar plate and incubate at 37 0 5 C for 24 h A 5 2 Input influent sample Subject 1 ml input sample to serial dilution 10 4 10 5 Using pour plating technique take 1 ml of each dilution and plate it on to M Endo agar medium Input sample shall also be analyzed in duplicate Incubate the plates at 37 0 5 C for 24 h A 7 VERIFICATION AND COLONY COUNT Observe the plates after the incubation period E Coli colonies on M Endo agar will be with definite round amp dark colonies with Green Metallic sheen Count the colonies in influent and effluent sample plates using a colony counter Pickup typical colonies make a suspension and carryout Gram staining and observe under the microscope test protocol Gram negative short rods measuring about 0 5 u m in diameter occurring singly conforms to E Coli 18 A 8 RESULTS AND COMPUTATION A 8 1 Disinfection efficiency shall be calculated using the following formulae Input CFU 100 ml Output CFU 100
18. ml Percent disinfection X 100 Input CFU 100ml A 8 2 The device shall pass the following disinfection level Organism Influent Effluent Minimum log challenge Reduction reduction E Coli 107 100ml 99 9999 6 100 ml 19 TEST 6 CYST REDUCTION TEST FOR POU R O WATER PURIFIER Application This method applicable for cyst reduction claim The system shall reduce the number of 3 4 micrometer particle form an influent challenge level of at least 50 000 5 X 10 Particle per millimeter by at least 99 95 Analytic Method Standard particle counting technique from particle counter manufacturers shall be used for cyst reduction test Post membrane shall be removed prior to testing Apparatus e Standard particle counter or Haemocytometer Test water Use deionized water with 2 lt microsiemen cm conductivity shall be used Influent Challenge Fine dust or latex beads shall be used to influent challenge water to achieve at least 50 000 5x 10 particle per millimeter of 3 4 um diameter 20 TEST 6 MATERIAL EXTRACTION FOR POU R O WATER PURIFIER Application To evaluate the concentration of the extractable contaminants from the material in contact with drinking water Apparatus e GC MS e Jon selective Electrode e ICP or AAS GF Test Procedure as per IS 9845 1998 Exposure of System or Components e The system can be install
19. nimum and maximum input water pressure prescribed by the manufacture Pre and post membrane filter shall not be removed prior to testing 13 TEST 2 INORGANIC REDUCTION TEST FOR POU R O WATER PURIFIER Application This method applicable for inorganic chemical reduction which can be used for the specific contaminants such as arsenic cadmium chromium copper mercury lead and selenium Analyte All analysis shall be conducted in accordance with the IS Standards mentioned in Table 1 Inorganic Chemical Reduction Test Water Chlorine free deionized water shall be used with the following specific characteristic maintains throughout the test reduction claims Turbidity lt INTU pH 7 50 5 Temperature 217 2 C Conductivity 1 microsiemen Sodium chloride shall be added to the test water to achieve a challenge concentration of 1500 100 mg L TDS Summary of Method To check the specific contaminants reduction claim the system shall reduce the level of the contaminants from the influent challenge level so the arithmetic mean of all product water sample result 90 of the individual water samples is less than or equal to the maximum allowable product water concentration 14 TEST 3 NITRATE NITRITE REDUCTION FOR POU R O WATER PURIFIER Application This method applicable for nitrite and nitrate reduction claim To qualify for the nitrate nitrite reduction claim the system shall reduce the level of the contaminant
20. nto Challenge water to avoid precipitation TDS reduction Daily production rate recovery rating and efficiency rating Two systems shall be conditioned in accordance with the manufacturer s instruction using test waters specified in the above table The system shall be tested using the appropriate influent challenge water at the minmum and maximum input water pressure priscribed by the manufacture Pre and post membrane filter shall not be removed prior to testing SAMPLING FREQUENCY System Components Operating and Sampling Plan Systems No of Units Sampling pressure System with 2 units Day 1 4 hr and 12hr storage tank and One at Day 2 to 4 5 of the first days production rate automatic shut off Minimum every 6 hr pressure Day 5 and 6 rest under pressure One at Day 7 144hr and 4 hr Maximum pressure prescribed by Manufacturer Counter top 2 units Day 1 4 hr and 12hr systems with One at Day 2 to 4 5 of the first days production rate storage tanks or Minimum every 6 hr reservoir pressure Day 5 and 6 rest under pressure One at Day 7 144hr and 4 hr 11 Maximum pressure prescribed by Manufacturer Systems without 2 units Day 1 4 hr and 12hr storage Tank One at Day 2 to 4 5 of the first days production rate Minimum every 6 hr pressure Day 5 and 6 rest under pressure One at Day 7 144hr and 4 hr Maximum pressure prescribed by Manufacturer System with no 2 units Day 1 4
21. s from the influent challenge level so that the arithmetic mean of all product water sample is less than or equal to the maximum allowable product water concentration Analysis Method Analysis shall be in accordance with the IS standards mentioned in Table 1 Test Procedure Contaminant Reduction Requirements Contaminants Individual Average Maximum Compounds Influent 1 Influent allowable Sample challenge product Point limits level mg L water level mg L mg L Nitrate plus 30 04 20 30 0 10 10 0 NaNO nitrite as N added as NaNO 27 mg L NO and 3 mg L NO2 Test Water specification Chlorine free deionized water shall be used with the following specific characteristic maintains throughout the test reduction claims Turbidity lt INTU pH 7 50 5 Temperature 217 2 C Conductivity 1 microsiemen Sodium chloride shall be added to the test water to achieve a challenge concentration of 1500 100 mg L TDS For Preparing Challenge Water Add Solution as Follows Test Influent Material AR Quality L Quantity 100 Parameter Challenge Grade sock Solution L challenge Concentration Water Nitrate 30mg L 27 Na NO amp 1 37 gr L gives Add 2 7 lit 100 mg L as NaNO and 3 mg L as NO2 1000ppm L of challenge water 15 TEST 4 TURBIDITY REDUCTION ORGANIC AND INORGANIC SOLIDS TEST POU R O WATER PURIFIER Applic
22. t of the system to regulate the flow 5 3 Performance 5 3 1 TDS reduction Reverse Osmosis drinking water treatment systems shall reduce the influent challenge level of maximum operating TDS ppm recommended by manufacturer by at least 75 or the output TDS shall be less than or equal to 500 mg l as per the maximum desirable concentration specified in IS 10500 when tested as per IS 3025 Part 16 For testing the feed water shall have min 1500 mg l of TDS if the manufacturer s operating TDS is more than 1500 mg l the same shall be taken as input TDS for testing The test water may be generated by adding sodium chloride in to demineralized water to adjust the maximum TDS level recommended by manufacturer TDS analysis shall be done on product water only after adequate flushing of the system is carried out as specified by manufacturer 5 6 2 Chemical Reduction The manufacturer shall declare on the product performance with regards to reduction capabilities of RO membrane for chemical pollutants namely pesticides Nitrate Fluoride Arsenic Lead Mercury etc These tests shall be conducted as per Table No 1 The manufacturer s claims shall be less than or equal to Maximum allowable product water level as shown in the Table No 1 5 6 3 Microbiological reduction When tested in accordance with Annex A the RO unit shall deliver microbiologically safe drinking water 5 7 PERCENT RECOVERY OF PURIFIED WATER AND DAILY PRODUCTION RATE
23. ter has detiorated due to contamination of soil and water by biological and industrial wastes and over exploitation of ground water Tapping of ground water for drinking purpose has also increased in urban and semi urban areas to meet the growing demand Ground water is characterized by high dissolved solids mineral contents and sometime contaminated by heavy metals and harmful natural elements like fluoride and arsenic etc Reverse Osmosis technology combined with sediment filter and carbon filter has proven to be very effective water treatment method for removing various inorganic organic and microbiological contaminants from the water Realizing the fact many organized and un organized sectors have entered RO technology based water purification market This trend necessitates the importance and urgency of drawing a standard for RO based water purification systems This standard also covers the testing of water contact materials for their safety under Global migration test 1 SCOPE This draft Standard covers Reverse Osmosis based POU water purifier that reduces TDS of water reduces chemical contamination to safe level and removes physical particles including microbiological impurities TERMINOLOGY For the purpose of this standard the following definition shall apply 1 1 Reverse Osmosis Reverse Osmosis is a pressure driven membrane separation technique to reduce dissolved solutes such as minerals salts organic species etc from water
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